BZ014C453ZSB88 AVX Corporation, BZ014C453ZSB88 Datasheet - Page 23
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BZ014C453ZSB88
Manufacturer Part Number
BZ014C453ZSB88
Description
CAPACITOR, BESTCAP 45 MILLI FARAD 4.5V CAPACITOR, BESTCAP 45 MILLI FARAD 4.5V
Manufacturer
AVX Corporation
Series
BESTCAPr
Datasheet
1.BZ015B303ZSB.pdf
(26 pages)
Specifications of BZ014C453ZSB88
Capacitance
45MF
Voltage Rating, Dc
4.5V
Capacitor Dielectric Type
ELECTRONIC
Temp, Op. Max
70(DEGREE C)
Temp, Op. Min
-20(DEGREE C)
Rohs Compliant
YES
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4.4 BESTCAP FOR GSM/GPRS PCMCIA
MODEMS
There is an increasing usage of PCMCIA modem cards for
wireless LAN and WAN (Wide Area Network) applications.
The PCMCIA card is used as an accessory to Laptops and
PDA’s, and enables wide area mobile Internet access,
including all associated applications like Email and file
transfer.
With the wide spread use of GSM networks, a PCMCIA
GSM modem is a commonly used solution. To achieve
higher speed data rates, GSM networks are now being
upgraded to support the GPRS standard.
The design challenge:
GSM/GPRS transmission requires a current of approximate-
ly 2A for the pulse duration. The PCMCIA bus cannot supply
this amount of pulsed current. Therefore, there is a need for
a relatively large capacitance to bridge the gap.
The capacitor supplies the pulse current to the transmitter,
and is charged by a low current during the interval between
pulses.
22
BestCap
High Power Pulse Supercapacitors
V
PCMCIA bus
+
from
Current
Voltage
2 Ampere
Capacitor
®
Ultra-low ESR
Transmitter
* V=V
THE SOLUTION:
It is assumed that during the pulse, 0.5A is delivered by the
battery, and 1.5A by the capacitor.
Conclusion: High capacitance is needed to minimize voltage
drop. A high value capacitance, even with a higher ESR,
results in a lower voltage drop. Low voltage drop minimizes
the conductive and emitted electro magnetic interference,
and increases transmitter output power and efficiency.
Voltage After Pulse (V)
Operating Voltage (V)
Rated Capacitance
@ 0.5msec Pulse
Cutoff Voltage (V)
Voltage Drop* (V)
(25% duty cycle)
V
Capacitance
GPRS Pulse
(milli Farad)
(milli Farad)
1
(milli ohm)
Pass/FAIL
Size (mm)
+V
ESR
2
=1.5A*ESR + (1.5A*1.154msec)/C
Chip Tantalum
SOLUTION A
.4 x 7 x 2
0.804V
2.896
FAIL
2.2
2.2
3.7
3.1
50
}
}
V
V
BZ154B473ZSB
SOLUTION B
1
2
20 x 15 x 2.1
BestCap
= I*ESR
= I* t/C
0.268V
3.432
PASS
160
3.7
3.1
t
47
30
®